Stefan Colonna Walewski (June 9, 1897 - May 19, 1955) was a Polish-born diplomat and antiquities specialist, publicised as a foremost expert in occult artifacts. As proprietor of his "Esoterica" shop in New York City, Count Colonna-Walewski maintained a large collection of "mystic and occult curios," at one point boasting over 20,000 objects and "the largest library on demonology in America".[3]